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projecten1/lib/python3.6/site-packages/PIL/McIdasImagePlugin.py

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+#
+# The Python Imaging Library.
+# $Id$
+#
+# Basic McIdas support for PIL
+#
+# History:
+# 1997-05-05 fl  Created (8-bit images only)
+# 2009-03-08 fl  Added 16/32-bit support.
+#
+# Thanks to Richard Jones and Craig Swank for specs and samples.
+#
+# Copyright (c) Secret Labs AB 1997.
+# Copyright (c) Fredrik Lundh 1997.
+#
+# See the README file for information on usage and redistribution.
+#
+
+import struct
+from . import Image, ImageFile
+
+__version__ = "0.2"
+
+
+def _accept(s):
+    return s[:8] == b"\x00\x00\x00\x00\x00\x00\x00\x04"
+
+
+##
+# Image plugin for McIdas area images.
+
+class McIdasImageFile(ImageFile.ImageFile):
+
+    format = "MCIDAS"
+    format_description = "McIdas area file"
+
+    def _open(self):
+
+        # parse area file directory
+        s = self.fp.read(256)
+        if not _accept(s) or len(s) != 256:
+            raise SyntaxError("not an McIdas area file")
+
+        self.area_descriptor_raw = s
+        self.area_descriptor = w = [0] + list(struct.unpack("!64i", s))
+
+        # get mode
+        if w[11] == 1:
+            mode = rawmode = "L"
+        elif w[11] == 2:
+            # FIXME: add memory map support
+            mode = "I"
+            rawmode = "I;16B"
+        elif w[11] == 4:
+            # FIXME: add memory map support
+            mode = "I"
+            rawmode = "I;32B"
+        else:
+            raise SyntaxError("unsupported McIdas format")
+
+        self.mode = mode
+        self.size = w[10], w[9]
+
+        offset = w[34] + w[15]
+        stride = w[15] + w[10]*w[11]*w[14]
+
+        self.tile = [("raw", (0, 0) + self.size, offset, (rawmode, stride, 1))]
+
+
+# --------------------------------------------------------------------
+# registry
+
+Image.register_open(McIdasImageFile.format, McIdasImageFile, _accept)
+
+# no default extension